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. 1992 Mar;50(3):590–597.

Recombination between rhodopsin and locus D3S47 (C17) in rhodopsin retinitis pigmentosa families

Chris F Inglehearn, Douglas H Lester, Rumaisa Bashir, Uzma Atif, T Jeffrey Keen, Amalia Sertedaki, Janet Lindsey, Marcelle Jay, Alan C Bird, G Jane Farrar, Peter Humphries, Shomi S Bhattacharya
PMCID: PMC1684283  PMID: 1539595

Abstract

Autosomal dominant retinitis pigmentosa (adRP) has shown linkage to the chromosome 3q marker C17 (D3S47) in two large adRP pedigrees known as TCDM1 and adRP3. On the basis of this evidence the rhodopsin gene, which also maps to 3q, was screened for mutations which segregated with the disease in adRP patients, and several have now been identified. However, we report that, as yet, no rhodopsin mutation has been found in the families first linked to C17. Since no highly informative marker system is available in the rhodopsin gene, it has not been possible to measure the genetic distance between rhodopsin and D3S47 accurately. We now present a linkage analysis between D3S47 and the rhodopsin locus (RHO) in five proven rhodopsin–retinitis pigmentosa (rhodopsin-RP) families, using the causative mutations as highly informative polymorphic markers. The distance, between RHO and D3S47, obtained by this analysis is θ = .12, with a lod score of 4.5. This contrasts with peak lod scores between D3S47 and adRP of 6.1 at θ = .05 and 16.5 at θ = 0 in families adRP3 and TCDM1, respectively. These data would be consistent with the hypothesis that TCDM1 and ADRP3 represent a second adRP locus on chromosome 3q, closer to D3S47 than is the rhodopsin locus. This result shows that care must be taken when interpreting adRP exclusion data generated with probe C17 and that it is probably not a suitable marker for predictive genetic testing in all chromosome 3q–linked adRP families.

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Selected References

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